Patent Thicket

What It Means

A patent thicket is a collection of multiple overlapping patents that collectively create a barrier to market entry for competitors. The term evokes the image of a dense, tangled hedge of thorns that is difficult to navigate without touching (infringing) multiple patents. Patent thickets arise both organically — when multiple companies independently patent different aspects of a complex technology — and strategically, when a single company deliberately builds a dense web of related patents to maximize the difficulty and cost of designing around its intellectual property. In the pharmaceutical industry, patent thickets around a single drug can involve dozens of patents covering the active compound, formulation, manufacturing process, methods of treatment, dosing regimens, metabolites, and polymorphic forms. The branded manufacturer Humira (adalimumab) is a notorious example: AbbVie accumulated over 100 patents surrounding the drug, creating a thicket that delayed biosimilar entry in the United States until 2023, years after the original composition patent expired. In technology, patent thickets are common in smartphones, wireless communications, and semiconductors, where a single product may implicate thousands of patents held by dozens of companies. These thickets often lead to cross-licensing agreements or patent pools, where competitors agree to share access to avoid mutually destructive litigation. The economic effect of patent thickets is debated: they may incentivize continued R&D investment and protect genuine innovation, but they can also block legitimate competition, raise consumer prices, and create "hold-up" situations where companies must negotiate with multiple patent holders to bring any product to market.

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